<ol>
  <li>Choose the limiting entity to which you want to trim or extend one or
  more other entities.</li>
  <li>Choose the entities that you want to trim to the limiting entity. Often
  there are two possibilities for the entity to be trimmed. In the example
  below, you might want the top part of the line to remain in the drawing and
  the lower part to be trimmed away. In that case you would have to click the
  trim entity at the upper part. Always click that part of the entity which you
  want to retain. 
  <br />
  <img src="TrimFigure.png" class="figure" /></li>
  <li>Right click twice or press Escape twice to terminate the tool.</li>
</ol>
